New product announcements: 01/20/2010 Worm-Drive Circular Saw: Extreme Bevel Capacity The DeWalt DWS535 Worm-Drive Circular Saw features a 53° bevel capacity, which allows the user to set common-cut angles quickly and accurately. The saw boasts improved durability over previous models, including a Toughcord cord-retention system and a sturdy magnesium shoe. An extra-wide saw hook allows for engineered lumber up to 2 ½ in. thick, and a top-access spindle lock engages immediately, preventing oil leaks. Dual ports in the shoe allow it to work with a DeWalt rip guide for accurate rip cuts up to 14 ½ in. DeWalt; 800-433-9258; www.dewalt.com
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.